Reason for using observables

[saikiriti11]

Hi,

1. I would like to know why observables are being used in asynchronous way for finding the device
   information instead of returning the respective information synchronously without the need to
   subscribe to observable.

2. Is there any way where the provided services have methods which return boolean values for
   finding device information which can be used in java script.
   For example, I want isMobile() in the service which returns a boolean value just like *isMobile directive.

[no-more]

Hello,

1 - Not sure but maybe just to make uniform all the code with observable.
2 - Don't know sorry